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...simple and it emphasizes balance rather than focusing on specific nutrients. However, SACN does recommend a range of intake levels for all nutrients and energy for males and females throughout life, known as the dietary reference values (DRVs). Because individuals vary in their exact energy requirements, depending on sex, age, occupation and many other factors, often the...

...simple diagram of the Earth system, showing the interactions of the atmosphere, biosphere (living things), hydrosphere (liquid water), cryosphere (frozen water) and land surface. These realms are illustrated respectively with images of a blue sky with clouds, a forest, the sea, snow on mountains and a crop. Red arrows are drawn to show that each realm interacts with each...

...simple in structure and yet capable of directing the way we grow, reproduce and survive; hence it is often referred to as the genetic blueprint — the plan — of human life. Since genes are part of chromosomes they too are composed of DNA, which is why DNA is referred to as the genetic material. The following video clip contains a little more information about DNA....